Error C4716: 'operator<<': must return a value

Question

I am struggling to get an appropriate return for this operator (it is not my code, just trying to correct it and I am not as good as I should be in C++ to correct it) can anybody help me with this, it is datatype class defined for high level design of digital circuits.

How to return this temp without an error, is there any special approach to this?

inline friend std::ostream& operator << ( std::ostream& os, const sc_float &v)
{
   if (c_DEBUG) std::cout << "debug: operator << called " << endl; //debug
   // fixme - this is only copy of sc_float2double function
   double temp;
   temp = (double)v.man / exp2(m_width);
   temp += 1.0;
   temp *= exp2((double)v.exp - exp2((double)e_width - 1.0) + 1.0);
   temp *= (v.sign == true ? -1.0 : 1.0);
   //os << "(" << v.sign << " , " << v.exp << " , " << v.man << ")"; // debug
   os << temp;
 }

as I add there return os;

I got 226 errors which points to systemC library and instances there. Has anybody done declaration of stream operator with regards to systemC classes or have anybody idea how it is done?

Return the thing that is an `std::ostream`: `return os;` – molbdnilo May 22 '15 at 16:30 — molbdnilo, May 22 '15 at 16:30

score 6 · Accepted Answer · answered May 22 '15 at 16:38

Your function is missing its return. The << operator should return a reference to the stream that it was using so that you can chain operations together like

cout << foo << bar << foobar;

To fix your function you just need to return the ostream that you are using in your function

inline friend std::ostream& operator << ( std::ostream& os, const sc_float &v)
{
    //...
    os << temp;
    return os;// <-- this returns the stream that we are unsing so it can be used by other functions
}

Error C4716: 'operator<<': must return a value

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